Single Phase Transformer Less Inverter using Wide Input Voltage Range for Solar PV Application

Solar energy is a very large, inexhaustible source. After wind energy, solar energy is considered fastest developing non-conventional energy source. Solar energy is environment friendly and best suitable for decentralized application. Solar PV performs direct conversion of sunlight to electricity. Solar PV mainly characterized with variable output power because of the solar irradiance and cell temperature. To increase the energy generation efficiency of solar PV, research effort is focused in the direction to maximize the efficiency of solar cell via manufacturing technology and also explore the progress in the power electronic devices for small and large scale applications of the power system. This paper presents trasformerless single phase inverter for solar photovoltaic application. From the solar PV panel, the variable supply voltage of 40V-60V is regulated and closed loop boost converter receives input dc voltage and produces constant DC voltage of 310V modeled in MATLAB/Simulink environment. Single phase inverter was used to convert DC voltage to chopped AC voltage for AC load supply. After filtering the output voltage of the inverter to give pure sinusoidal alternating current of 210V RMS. Inverter output voltage has a very low total harmonic distortion of 1.56 % which makes the system suitable for grid network and local AC load. This paper introduces the implementation of running the single phase asynchronous machine.